package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.core.annotation.Order;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

//检查用户是否已经完成登录
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Order(1)//指定过滤器的执行顺序，值越大顺序越靠后
@Slf4j
public class LoginCheckFilter implements Filter {

    public static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        //向下转型，强转
        HttpServletRequest request=(HttpServletRequest)servletRequest;
        HttpServletResponse response=(HttpServletResponse)servletResponse;


        log.info("拦截到请求：{}",request.getRequestURI());

        //1.获取本次请求的URI
        String requestURI=request.getRequestURI();

        //定义不需要处理的请求路径
        String[] urls=new String[]{
                "/employee/login",
                "/employee/logout",
                //"/employee/page",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"


        };

        //2.判断本次请求是否需要处理
        boolean check=check(urls,requestURI);

        //3.如果不需要处理，则直接放行
        if(check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain. doFilter(request,response);
            return;
        }

        //4-1.判断登陆状态，如果登录则放行
        if(request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("employee"));

            Long empId=(Long)request.getSession().getAttribute("employee");

            BaseContext.setCurrentId(empId);


            filterChain.doFilter(request,response);
            log.info("用户已登录");
            return;
        }
        //4-2.判断移动端用户登陆状态，如果登录则放行
        if(request.getSession().getAttribute("user")!=null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));

            Long userId=(Long)request.getSession().getAttribute("user");

            BaseContext.setCurrentId(userId);


            filterChain.doFilter(request,response);
            log.info("用户已登录");
            return;
        }

        log.info("用户未登录");
        //5.如果未登录则返回登录结果，通过输出流方式向客户端返回页面数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;




    }

    //匹配路径，检查本次请求是否需要放行
    public boolean check(String[] urls,String requestURI){
        for(String url:urls){
            boolean match=PATH_MATCHER.match(url,requestURI);
            if(match){
                return true;
            }
        }
        return false;


    }
}
